Trust in the LORD with all your heart and lean not on your own understanding; in all your ways acknowledge him, and he will make your paths straight.

I think it's harder than we realize to trust in the Lord with your whole heart. You could think, yeah I'm trusting in the Lord. But with all your heart? That's a lot harder that it sounds. You need to lay your whole heart down before the Lord, show him every single part of it, and give it to him. But if you only gave him part of it, because you want to keep some of it for yourself, how can he  keeep your paths straight?